Graphite loses its ability to lubricate surfaces and changes into pyrolytic graphite when several crystallographic flaws bind these planes together. Graphite will float in midair above a powerful magnet because it is diamagnetic and highly anisotropic. It is not diamagnetic if it is produced in a fluidized bed at 1000–1300 °C; it is utilised in blood-contacting devices like mechanical heart valves heart valves and is known as pyrolytic carbon. Despite being extremely different substances, pyrolytic graphite and pyrolytic carbon are frequently mixed together. Because of their shear-planes, brittleness, and unpredictable mechanical properties, natural and crystalline graphites are not frequently used in their pure form as structural materials.
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